What should be divided by $$\dfrac{1}{2}$$ to obtain the greatest negative integer?
As we know that greatest negative number is $$-1$$.
Let $$y$$ be the number.
ACQ,
$$\Rightarrow \dfrac{1}{2}÷y=-1$$
$$\Rightarrow \dfrac{1}{2}\times\dfrac{1}{y}=-1$$
$$\Rightarrow y=\dfrac{-1}{2}$$
Therefore, $$\dfrac{-1}{2}$$ is the required number.